Unknown error when processing PHP form? -


below code simple form input/output. reason, question 1 seems working , questions 2 , 3 echo "something wrong." coded 3 questions exact same way throughout i'm not sure why question 2 , 3 aren't processing correctly. advice appreciated.

here html form:

      <form action="processor.php" method="post">       <h4>question # 1</h4>       <p>what grade in?</p>       <label class="checkbox"><input type="checkbox" name="grade" value="1"> freshmen</label>       <label class="checkbox"><input type="checkbox" name="grade" value="2"> sophomore</label>       <label class="checkbox"><input type="checkbox" name="grade" value="3"> junior</label>       <label class="checkbox"><input type="checkbox" name="grade" value="4"> senior</label>        <h4>question # 2</h4>       <p>what current gpa?</p>       <select>       <option name="gpa" value="4">3.5 or above</option>       <option name="gpa" value="3">3.0-3.4</option>       <option name="gpa" value="2">2.5-2.9</option>       <option name="gpa" value="1">2.0-2.4</option>       <option>lower</option>       </select>        <h4>question # 3</h4>       <p>where excel academically?</p>       <select multiple="multiple">       <option name="school" value ="1">mathematics</option>       <option name="school" value ="2">literature</option>       <option name="school" value ="3">history</option>       <option name="school" value ="4">humanities</option>       <option name="school" value ="5">science</option>       </select>       <div class="button">       <button class="btn btn-primary" input type="submit" name="submit" href="processor.php">submit</button>       </div>       </form>

here processor:

  <?php   function grades () {  $grade = $_post['grade'];  if ($grade =="1") {  echo "you're freshmen";  } elseif ($grade == "2") { echo "you're sophomore";  } elseif ($grade == "3") { echo "you're junior.";  } elseif ($grade == "4") { echo "you're senior.";  } else { echo "something wrong.";  }   }   function gpa () {  $gpa = $_post['gpa'];  if ($gpa =="1") {     echo "you need gpa."; } elseif ($gpa == "2") {     echo "you're average student."; } elseif ($gpa == "3") {     echo "you're above average student."; } elseif ($gpa == "4") {     echo "you're excellent sudent."; } else {     echo "something wrong."; }  }  function school () {  $school = $_post['school'];  if ($school =="1") {     echo "you're math";  } elseif ($school == "2") {     echo "you're lit";  } elseif ($school == "3") {     echo "you're history.";  } elseif ($school == "4") {    echo "you're humanities.";  } elseif ($school == "5") {    echo "you're science.";  } else {    echo "something wrong.";  }   }   include('viewpage.php');  ?>

and view page:

     <h4>question # 1</h4>      <p><?php grades($grade); ?></p>      <h4>question # 2</h4>      <p><?php gpa($gpa); ?></p>       <h4>question # 3</h4>      <p><?php school($school); ?></p>

the problem here

 <select name="gpa">  <option value="4">3.5 or above</option>

to access $_post['gpa'] <select> tag should have name property gpa not <option> tag

for $_post['school']

<select  name="school" multiple="multiple"> <option value ="1">mathematics</option>

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